5209999 has 2 divisors, whose sum is σ = 5210000. Its totient is φ = 5209998.

The previous prime is 5209957. The next prime is 5210003. The reversal of 5209999 is 9999025.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5209999 is a prime.

5209999 is a modest number, since divided by 9999 gives 520 as remainder.

5209999 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5200999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2604999 + 2605000.

It is an arithmetic number, because the mean of its divisors is an integer number (2605000).

Almost surely, 2^5209999 is an apocalyptic number.

5209999 is a deficient number, since it is larger than the sum of its proper divisors (1).

5209999 is an equidigital number, since it uses as much as digits as its factorization.

5209999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 43.

The square root of 5209999 is about 2282.5422230487. The cubic root of 5209999 is about 173.3587951583.

The spelling of 5209999 in words is "five million, two hundred nine thousand, nine hundred ninety-nine".